Add latency measurement system

content/renderer/gpu/compositor_thread.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_
 #define CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 32 matching lines @@
   webkit_glue::WebThreadImpl* GetWebThread() { return &thread_; }
 
   MessageLoop* message_loop() { return thread_.message_loop(); }
 
  private:
   // Callback only from the compositor's thread.
   void RemoveInputHandler(int routing_id);
 
   // Called from the compositor's thread.
   void HandleInputEvent(int routing_id,
+                        int64 input_number,
                         const WebKit::WebInputEvent* input_event);
 
   // Called from the compositor's thread.
   void AddInputHandlerOnCompositorThread(
       int routing_id,
       int input_handler_id,
       scoped_refptr<base::MessageLoopProxy> main_loop,
       const base::WeakPtr<RenderViewImpl>& render_view_impl);
 
   class InputHandlerWrapper;
   friend class InputHandlerWrapper;
 
   typedef std::map<int,  // routing_id
                    scoped_refptr<InputHandlerWrapper> > InputHandlerMap;
   InputHandlerMap input_handlers_;
 
   webkit_glue::WebThreadImpl thread_;
   scoped_refptr<InputEventFilter> filter_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_THREAD_H_